Silica capped CdS/Cd(OH)[sub]2[/sub] quantum dots for biological applications
2010
In the last few years, quantum confinement effects in semiconductor nanocrystals (quantum dots - QDs) have attracted a
significant amount of interest due to their new optical properties and also because of their potential applications in
biological systems. In this work, cadmium sulphide (CdS) nanoparticles were synthesized in aqueous medium and
passivated with Cd(OH)2. Polyphosphate ions were used in order to avoid particle aggregation. After the passivation
step, CdS/Cd(OH)2 quantum dots were coated with silica. Silica coating has been extensively investigated concerning its
properties in biocompatibilizing QDs to biological systems. Silica coated core-shell CdS/Cd(OH)2 water soluble QDs
optical properties were studied by absorption, excitation and emission spectroscopies, while their morphological
characterization was carried out by transmission electron microscopy.
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